ANALYSIS ON THE LEAKAGE OF SCREEN SUPER HEATER IN A THERMAL POWER PLANT
The macroscopic inspection,chemical composition analysis,metallographic structure analysis,hardness test,fracture morphology analysis,scale composition analysis,and mechanical property determination were conducted on the burst tube sample of a boiler screen superheater in a thermal power plant.The results show that under high temperature at a long-term,the tube wall of the screen type superheater undergoes oxidation,the surface oxidation cracks appear,the structure of the tube deteriorates,and the strength decreases,resulting in the tube section bursting due to prolonged high temperature.
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